What problems should be paid attention to when fertilizing vegetables
Chinese cabbage, Chinese cabbage, amaranth, celery, cabbage, etc., are very easy to absorb nitrate nitrogen fertilizer during growth, such as the application of ammonium nitrate, leaf vegetables absorb nitrate ions, nitrate ions will enter after human consumption The human body is poisoned by volume.
2. Do not water vegetables after applying urea
The nitrogen component contained in urea is ammonium nitrogen. Under the action of urease secreted by soil microorganisms, ammonium nitrogen is converted into ammonium carbonate or ammonium bicarbonate before it can be absorbed and used by vegetable roots. If water is applied immediately after application of urea or rain, the ammonium nitrogen will be lost. Therefore, regardless of whether urea is used as a base fertilizer or top dressing for vegetables, it should be watered 5 to 6 days after application, so that all of them are transformed and then watered to avoid loss.
3. Do not apply ammonium carbonate when the vegetable field is short of water
The chemical properties of ammonium bicarbonate fertilizers are extremely unstable and easily volatile. When applying ammonium bicarbonate in vegetable fields, whether it is used as a base fertilizer or top dressing, deep application should be carried out in the vegetable field when it is wet, and the soil should be covered immediately after application. If the weather is dry, it is not necessary to apply ammonium bicarbonate.
4. Do not spray high concentration nitrogen fertilizers for leafy vegetables
If foliar spraying of vegetables with urea, ammonium sulfate, etc., can make the vegetable leaves green and good in color, the content of harmful salts in green leafy vegetables will increase significantly, which in turn affects the health of consumers.
5. Don't use ammonium nitrogen fertilizer with higher concentration in the greenhouse vegetables
Due to the high temperature and high humidity in the greenhouse, under the appropriate temperature and humidity conditions, the high-concentration ammonium nitrogen fertilizer is easy to decompose under the action of soil enzymes, and finally converted into gaseous ammonia, which can cause vegetable ammonia poisoning and affect vegetables Quality and yield.
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